It also makes the delivery of the baby more difficult, with caesarean sections and forceps deliveries more common.
It also introduces new and important evidence in the debate on the risks of caesarean sections 'on demand'.
The practice drives up costs of neonatal intensive care and leads to a higher rate of caesarean sections.
Flexible systems have been introduced by some hospitals to try to reduce the number of women having Caesarean sections.
Caesarean sections have risen steadily since the mid-1990s and by 2011 accounted for a quarter of all births in Wales.
In the USA during the 70's and 80's we saw a dramatic rise in caesarean sections for a variety of reasons.
Caesarean Sections: The rate has gone up more than 50% in the last 15 years for a whole host of reasons.
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It used to be common in Caesarean sections (it dopes the mother but not the baby) but other drugs have superseded it.
Caesarean sections used to be a last resort for delivering babies who - for whatever reason - could not be delivered naturally.
They suggested some women were having caesarean sections without fully understanding why.
There are fears that many women are choosing to have Caesarean sections so that the time of delivery can be more accurately planned.
The first national study into Caesarean sections in the UK is discovering that the surgical procedure is now used in one in five births.
She added that the reasons for the increase in Caesarean sections were complex and not completely clear, but any interventions should be made on the basis of clinical need.
But, there was a trade-off: More women who took the supplement needed their labor to be induced or had caesarean sections because the babies stayed in the womb longer, said Dr. Makrides.
These interventions are stopping smoking, promoting single pregnancies in IVF treatments, reducing planned Caesarean sections - which are often carried out before due dates - unless there is a medical reason by 80%, providing progesterone supplements to women with high-risk pregnancies and cervical stitches for women with a "weak" cervix that could mean a baby does not go to term.
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